﻿48 CHIM.EROIDEI. 



five or six small, irregularly arranged, isolated patches ; 

 the oral aspect of the small anterior tooth (x.) is marked 

 with large, parallel, transverse, mammillated ridges. 



EnnuTcillen Coll. 



P. 151. The complete dentition exposed from above, and partly from 

 below, associated with three dermal plates ; noticed by 

 the present writer in the Aon. Mag. Nat. Hist. [6] vol. iv. 

 (1889), p. 278. The specimen is shown, of the natural 

 size, in PI. II. fig. 2, and the parts are marked in accord- 

 ance with the following description. The mandibular 

 teeth (md.) are both shown from the inner and oral aspect, 

 though partly obscured by the overlying palatines (pi.); 

 and, so far as preserved, each seems to be precisely similar 

 to the corresponding tooth in the group No. P. 477 (PL II. 

 fig. 3). The presymphysial tooth, situated close to the 

 position of the mandibular symphysis on the opposite side 

 of the slab, is considerably crushed and broken, and thus 

 appears relatively broader and more flattened than in the 

 fossils described above. The palatine teeth {pi.) are large, 

 thin, and plate- like, but unfortunately only exposed from 

 the attached surface. Each of these teeth is elongated 

 antero-posteriorly and must have originally possessed a 

 nearly straight outer margin, somewhat thickened, and 

 sharply deflected; the short anterior margin, forming an 

 acute angle with the outer, is likewise deeply deflected 

 and abuts against the vomerine tooth ; but the inner and 

 posterior margins are thin edges of nearly equal length, 

 and there is no appearance of the close apposition of the 

 right and left teeth in the median line. If the attached 

 surface be approximately parallel to the oral surface in 

 these teeth, there is a longitudinal median elevation, and 

 this gradually disappears in the broad posterior extremity 

 of the plate. The triangular vomerine tooth (v.) on each 

 side is also seen to be thin and plate-like in form, its 

 robust appearance, when viewed from the oral aspect, 

 being due to the sharp deflection of all the margins. The 

 pair of small anterior teeth (x) in advance of the vomerine 

 is somewhat displaced ; but the oral aspect of one (PI. II. 

 fig. 2 a) is well displayed, and exhibits the characteristic, 

 mammillated, transverse ridges, consisting apparently of 

 laminated dentine. Purchased, 1880. 



